Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acdde0f388e9471b031dacc06b9751a68b8dc24075a75faa7ebbdceab7a8ab3' 
  AND token = 'acxNK7D7ox5OfzXGqwQ3QYn0poWuRgTlglwENdx9N8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}